
where the uncertainties in Eq. (REF ) have been added in
quadrature. We refrain from listing \(h_4\)  since there is a strong dependence
on the higher order power-suppressed corrections [1]}.
The results in Eq. (REF ) can be compared to the
experimental measurements of the \(M_X\)  moments performed by
DELPHI [2]}:We thank P. Gambino for
clarification about the value of \(h_1\) .
\(h_1 &= 4.541\, (101) \, {\mathrm {GeV}}^2, \\h_2 &= 1.56 \, (18)\, (16) \, {\mathrm {GeV}}^4,\\h_3 &= 4.05\, (74)\, (32) \, {\mathrm {GeV}}^6.\) 
